We report the effect of the aluminum oxide substrate on the emission of monolithic AlGaAs-on-insulator nonlinear nanoantennas. By coupling nonlinear optical measurements with electron diffraction and microscopy observations, we find that the oxidation-induced stress causes negligible crystal deformation in the AlGaAs nanostructures and only plays a minor role in the polarization state of the harmonic field. This result highlights the reliability of the wet oxidation of thick AlGaAs optical substrates and further confirms the bulk chi(2) origin of second harmonic generation at 1.55 um in these nanoantennas, paving the way for the development of AlGaAs-on-insulator monolithic metasurfaces.

Role of the substrate in monolithic AlGaAs nonlinear nanoantennas

Ghirardini, Lavinia;Finazzi, Marco;Celebrano, Michele;
2018-01-01

Abstract

We report the effect of the aluminum oxide substrate on the emission of monolithic AlGaAs-on-insulator nonlinear nanoantennas. By coupling nonlinear optical measurements with electron diffraction and microscopy observations, we find that the oxidation-induced stress causes negligible crystal deformation in the AlGaAs nanostructures and only plays a minor role in the polarization state of the harmonic field. This result highlights the reliability of the wet oxidation of thick AlGaAs optical substrates and further confirms the bulk chi(2) origin of second harmonic generation at 1.55 um in these nanoantennas, paving the way for the development of AlGaAs-on-insulator monolithic metasurfaces.
2018
harmonic generation and mixing; integrated optics devices; subwavelength structures; Biotechnology; Electronic, Optical and Magnetic Materials; Atomic and Molecular Physics, and Optics; Electrical and Electronic Engineering
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1043601
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